Development of the Method for Reducing Distortions Associated with the Parasitic Third Harmonic of Voltage Frequency of the Electrical Network

At present, the problem of protection measures against distortions of measured and calculated parameters by signals, corresponding to the third harmonic of the main frequency is quite acute, it being the main parasitic signal entering the distribution networks. The purpose of this study is to develop a method for reducing distortions caused by the third harmonic frequency in distribution networks. This is achieved by the fact that each half of the period of the frequencies of the electrical network is additionally determined by the time corresponding to 5/6, 4/6, 3/6, 2/6, 1/6 of its part. We can measure the value of the measured signal at each additional time, sum up the values obtained in the main and additional moments in n adjacent halves of the period, calculate the average amplitude value of the signal for n adjacent half periods and the average amplitude value of the measured signal is obtained by dividing the received value by the coefficient equaled to 1+√3/2+1/2.